Film position tracking device and polyester film stretching device

Abstract

The utility model relates to a film position tracking device and a polyester film stretching device. The film position tracking device comprises a high-speed camera and a processor, the film position tracking device processes a film picture shot by a high-speed camera through a processor to obtain the offset of the edge part of the film relative to a base line; the polyester film stretching device comprises a transverse stretching device, an edge controller and the film position tracking device. And the edge controller is used for adjusting the breadth of the transverse stretching device according to the film offset obtained by the film position tracking device, so that the chain clamp of the transverse stretching device clamps the edge of the film. According to the film position tracking device and the polyester film stretching device, the breadth of the transverse stretching device can be adjusted according to the real-time position information of the film, the consistency of the position of the film and the position of the chain clamp is kept, the requirement that the specification of a film product can be changed without manual adjustment in a continuous production mode is met, and the production efficiency is improved. And the production efficiency is improved, and the difference of manual operation is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of polyester material strip production, and specifically relates to a film position tracking device and a polyester film stretching device. Background Art

[0002] Finished optical films have been widely used in daily life, and the market demand is increasing, and the quality requirements for polyester film are getting higher and higher. In the existing polyester film processing process, the polyester melt needs to be stretched after the casting process. The stretching method is the secondary stretching method, which is first longitudinally stretched and then transversely stretched again. The film is clamped by the chain clamps at both ends of the transverse stretching equipment, and preheated in the preheating zone where the track remains unchanged. In the stretching zone, the track begins to widen and then the film is stretched transversely, and then heat treated in the shaping zone to shape the film; finally, it is cooled in the cooling zone to complete the transverse stretching of the film. After the film is stretched, the film is given physical properties such as tensile strength in the longitudinal and transverse directions to meet product requirements.

[0003] After the polyester film is longitudinally stretched, it needs to be transversely stretched. Before entering the transverse stretching device, the film runs on the guide roller. The film can be stably exhibited and run relatively stably without shaking. In order to perform the transverse stretching operation of the polyester film, the two ends of the film need to be clamped by the chain clamps on both sides of the entrance of the TDO (transverse stretching device) and pulled horizontally before entering the TDO device. Therefore, it is necessary to ensure that the chain clamp and the end of the film are on the same vertical plane to ensure that the chain clamp can clamp the end of the film and complete the subsequent transverse stretching process. However, when the thickness of the polyester film is adjusted or changed, the width of the film will change after the longitudinal stretching is completed, which will cause the position of the film end and the chain clamp position to be not on the same vertical plane, causing problems such as the film being unclamped or the film being squeezed by the chain clamp.

[0004] The prior art is to install a film position correction device, namely, an EPC correction device, at the entrance of the chain clamp track on both sides of the longitudinal stretching device. The main function is to ensure that the end of the film and the chain clamp are on the same cross section to ensure that the chain clamp can be accurately clamped on the end face of the film to perform the transverse stretching process. However, before the film enters this EPC device, it is necessary to manually place the film on the EPC sensing device and adjust this device to ensure that the film is located in the working position of the EPC sensing device, otherwise the EPC device cannot detect the position of the film and the EPC cannot function. Similarly, once the position of the film changes, especially when it exceeds the range of automatic detection of the EPC (generally this range is within the set value ±20mm), the EPC device cannot function, that is, the chain clamp track cannot be adjusted, resulting in the film and the chain clamp position not being on the same cross section, causing the film to be detached or the film to be squeezed by the chain clamp. In order to deal with the occurrence of such problems, the prior art often manually adjusts the set value to ensure that the EPC is within the automatic adjustment range.

[0005] During the film production process, when the longitudinal stretching parameters, thickness, width and other parameters are adjusted significantly, the film width cannot be monitored in time due to the relatively fast film running speed (350-450m / min), and this process cannot be manually intervened, which will cause EPC to be unable to adjust the track width in time, resulting in problems such as unclamping. Therefore, when adjusting the stretching parameters, thickness, width and other parameters on a large scale, it is necessary to leave the production operation mode and enter the adjustment mode, which will waste time and cause material loss.

[0006] Patent CN113682869A discloses an automatic deviation-correcting device for winding optical films, including a bracket assembly, an optical sensor mounted on the bracket assembly, the optical sensor being arranged near the edge of the optical film, a fixed bracket and a driving assembly mounted on the fixed bracket, the bracket assembly being slidably mounted on the fixed bracket and connected to the driving assembly, the driving assembly driving the bracket assembly to make linear reciprocating motion along the width direction of the optical film; the driving assembly is arranged to drive the bracket assembly, driving the bracket assembly to make linear reciprocating motion along the width direction of the optical film, so that the optical sensor regularly changes its detection position; the automatic deviation-correcting device makes the small protrusions on each circle of the rolled-up optical film evenly dispersed, reduces the risk of large protrusions forming on the edge of the optical film after winding, and improves the production quality; however, the tracking device of the patent is only applicable to the case where the speed of the film is relatively slow (generally below 150 m / min), and is not applicable to the above-mentioned film in the stretching process, because the above-mentioned film runs at a relatively fast speed during the stretching process, generally 350 to 450 m / min. Utility Model Content

[0007] In order to solve the problems existing in the prior art, the utility model provides a film position tracking device and a polyester film stretching device.

[0008] In order to achieve the above purpose, the scheme adopted by the utility model is as follows:

[0009] A film position tracking device includes a left high-speed camera, a first processor, a right high-speed camera, and a second processor;

[0010] The left high-speed camera is located above the plane where the film is located. The left boundary of the field of view of the left high-speed camera coincides with the baseline a, and the right boundary of the field of view coincides with the center line of the film. The baseline a is the running track of the left side of the film at the film entrance of the transverse stretching device when the width of the film does not change after longitudinal stretching.

[0011] The first processor is used to process the film image taken by the left high-speed camera to obtain the rightward offset a of the left side of the film relative to the baseline a;

[0012] The right high-speed camera is located above the plane where the film is located. The left boundary of the field of view of the right high-speed camera coincides with the center line of the film, and the right boundary of the field of view coincides with the baseline b. The baseline b is the running track of the right side of the film at the film entrance of the transverse stretching device when the width of the film does not change after longitudinal stretching.

[0013] The second processor is used to process the film image taken by the right high-speed camera to obtain the leftward offset b of the right side of the film relative to the baseline b.

[0014] As the preferred technical solution:

[0015] A film position tracking device as described above also includes a left light source and a right light source; the left light source and the right light source are both located below the plane where the film is located; the left light source is located directly below the left high-speed camera, and the right light source is located directly below the right high-speed camera.

[0016] The film position tracking device as described above further includes a mounting bracket; a left high-speed camera and a right high-speed camera are symmetrically arranged on the mounting bracket.

[0017] In the film position tracking device as described above, the left light source and the right light source are symmetrically arranged on the mounting bracket.

[0018] The present invention also provides a polyester film stretching device using the above-mentioned film position tracking device, including a transverse stretching device, a left side controller, a right side controller, and a film position tracking device;

[0019] The transverse stretching device includes a left guide rail, a chain clamp running on the left guide rail, a right guide rail, and a chain clamp running on the right guide rail;

[0020] The left side controller is connected to the left guide rail and the first processor at the same time. The left side controller is used to adjust the position of the left guide rail in real time so that the offset c to the right relative to the initial position is equal to the offset a. When the left guide rail is in the initial position, the chain clamp running on the left guide rail can clamp the left side of the film when the width of the film does not change after the film is longitudinally stretched;

[0021] The right side controller is connected to the right guide rail and the second processor at the same time. The right side controller is used to adjust the position of the right guide rail in real time so that its offset d to the left relative to the initial position is equal to the offset b. When the right guide rail is in the initial position, the chain clamp running on the right guide rail can clamp the right side of the film when the width of the film does not change after longitudinal stretching.

[0022] Beneficial effects:

[0023] The utility model discloses a film position tracking device and a polyester film stretching device, which can feed back the specification changes of the film to the track control system of the biaxial stretching equipment in real time under the sampling and comparison of the high-speed camera, adjust the track width of the transverse stretching device according to the real-time position information of the film, ensure the consistency of the position of the film and the chain clamp track, and meet the requirements of completing the change of film product specifications without manual adjustment in the continuous production mode, thereby improving production efficiency and reducing the difference in manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a film position tracking device of the utility model;

[0025] Among them, 1-left high-speed camera, 2-right high-speed camera, 3-right light source, 4-mounting bracket. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0027] A film position tracking device, such as Figure 1 As shown, it includes a left high-speed camera 1, a first processor, a right high-speed camera 2, a second processor, a left light source, a right light source 3 and a mounting bracket 4;

[0028] like Figure 1As shown, the left high-speed camera 1 is located above the plane where the film is located, the left boundary of the field of view of the left high-speed camera 1 coincides with the baseline a, and the right boundary of the field of view coincides with the center line of the film; the baseline a is the running track of the left side of the film at the film entrance of the transverse stretching device when the width of the film does not change after longitudinal stretching;

[0029] The right high-speed camera 2 is located above the plane where the film is located. The left boundary of the field of view of the right high-speed camera 2 coincides with the center line of the film, and the right boundary of the field of view coincides with the baseline b; the baseline b is the running track of the right side of the film at the film entrance of the transverse stretching device when the width of the film does not change after longitudinal stretching;

[0030] The left light source is located directly below the left high-speed camera 1 and below the plane where the film is located;

[0031] like Figure 1 As shown, the right light source 3 is located directly below the right high-speed camera 2 and below the plane where the film is located.

[0032] like Figure 1 As shown, the left high-speed camera 1 and the right high-speed camera 2 are symmetrically arranged on the mounting bracket 4;

[0033] The first processor is used to process the film image taken by the left high-speed camera 1 to obtain the rightward offset a of the left side of the film relative to the baseline a;

[0034] The second processor is used to process the film image taken by the right high-speed camera 2 to obtain the leftward offset b of the right side of the film relative to the baseline b.

[0035] A polyester film stretching device, comprising a transverse stretching device, a left side controller, a right side controller and the above-mentioned film position tracking device;

[0036] The transverse stretching device includes a left guide rail, a chain clamp running on the left guide rail, a right guide rail, and a chain clamp running on the right guide rail;

[0037] The left side controller is connected to the left guide rail and the first processor at the same time. The left side controller is used to adjust the position of the left guide rail in real time so that the offset c to the right relative to the initial position is equal to the offset a. When the left guide rail is in the initial position, the chain clamp running on the left guide rail can clamp the left side of the film when the width of the film does not change after the film is longitudinally stretched;

[0038] The right side controller is connected to the right guide rail and the second processor at the same time. The right side controller is used to adjust the position of the right guide rail in real time so that its offset d to the left relative to the initial position is equal to the offset b. When the right guide rail is in the initial position, the chain clamp running on the right guide rail can clamp the right side of the film when the width of the film does not change after longitudinal stretching.

Claims

1. A film position tracking device, characterized in that: including a left high-speed camera, a first processor, a right high-speed camera, and a second processor; The left high-speed camera is located above the plane where the film is located. The left boundary of the field of view of the left high-speed camera coincides with the baseline a, and the right boundary of the field of view coincides with the center line of the film. The baseline a is the running track of the left side of the film at the film entrance of the transverse stretching device when the width of the film does not change after longitudinal stretching. The first processor is used to process the film image taken by the left high-speed camera to obtain the rightward offset a of the left side of the film relative to the baseline a; The right high-speed camera is located above the plane where the film is located. The left boundary of the field of view of the right high-speed camera coincides with the center line of the film, and the right boundary of the field of view coincides with the baseline b. The baseline b is the running track of the right side of the film at the film entrance of the transverse stretching device when the width of the film does not change after longitudinal stretching. The second processor is used to process the film image taken by the right high-speed camera to obtain the leftward offset b of the right side of the film relative to the baseline b.

2. A film position tracking device according to claim 1, characterized in that: It also includes a left light source and a right light source; both the left light source and the right light source are located below the plane where the film is located; the left light source is located directly below the left high-speed camera, and the right light source is located directly below the right high-speed camera.

3. A film position tracking device according to claim 2, characterized in that: It also includes a mounting bracket; a left high-speed camera and a right high-speed camera are symmetrically arranged on the mounting bracket.

4. A film position tracking device according to claim 3, characterized in that: The left light source and the right light source are symmetrically arranged on the mounting bracket.

5. A polyester film stretching device, characterized in that: It comprises a transverse stretching device, a left side controller, a right side controller and a film position tracking device according to any one of claims 1 to 4; The transverse stretching device includes a left guide rail, a chain clamp running on the left guide rail, a right guide rail, and a chain clamp running on the right guide rail; The left side controller is connected to the left guide rail and the first processor at the same time. The left side controller is used to adjust the position of the left guide rail in real time so that the offset c to the right relative to the initial position is equal to the offset a. When the left guide rail is in the initial position, the chain clamp running on the left guide rail can clamp the left side of the film when the width of the film does not change after the film is longitudinally stretched; The right side controller is connected to the right guide rail and the second processor at the same time. The right side controller is used to adjust the position of the right guide rail in real time so that its offset d to the left relative to the initial position is equal to the offset b. When the right guide rail is in the initial position, the chain clamp running on the right guide rail can clamp the right side of the film when the width of the film does not change after longitudinal stretching.

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